Stadium: Hard Court Central Round: 25 Ground: Hardcourt outdoor
| ITF M15 Heraklion | 2021/05/25 06:30 | Aristotelis Thanos v Lorenzo Joaquin Rodriguez | 6-2,6-0 |
| ITF M15 Heraklion | 2021/05/23 10:00 | Aristotelis Thanos v Stephanos Schinas | 5-7,6-1,10-7 |
| ITF M15 Heraklion | 2021/05/20 06:30 | Yuta Shimizu v Aristotelis Thanos | 3-6,6-1,7-6 |
| ITF M15 Heraklion | 2021/05/19 06:30 | Christos Keisidis v Aristotelis Thanos | 2-6,2-6 |
| ITF M15 Heraklion | 2021/05/18 06:30 | Aristotelis Thanos v Eric Morris | 7-6,6-0 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/10 13:30 | Alexander Lazov v Aristotelis Thanos | 6-4,5-4 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/09 12:30 | Aristotelis Thanos v Pierre Faivre | 6-2,6-5 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/08 08:30 | Aristotelis Thanos v Ilya Snitari | 2-6,7-6,4-6 |
| ITF M15 Heraklion | 2021/05/26 11:55 | Yshai Oliel v Martin Breysach | 6-2,6-0 |
| ITF M15 Sibenik | 2021/05/19 17:05 | Martin Breysach v Jose Fco. Vidal Azorin | 6-4,3-6,2-6 |
| ITF M15 Sibenik | 2021/05/18 08:00 | Jaimee Floyd Angele v Martin Breysach | 7-5,6-1 |
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |
| ITF M15 Sibenik | 2021/05/16 10:00 | Rafael Kis Balazs v Martin Breysach | 0-6,4-6 |
| ITF M15 Majadahonda | 2021/05/02 16:15 | Alexis Musialek v Martin Breysach | 6-1,6-1 |
| ITF M15 Las Palmas | 2021/04/25 14:30 | Rafael Giotis v Martin Breysach | 5-7,6-2,10-4 |
| ITF M15 Sibenik | 2021/04/20 12:15 | Martin Breysach v David Pichler | 2-6,1-6 |